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DSA · Theory

Scapegoat Trees

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Theory

491/810

Scapegoat Trees

Scapegoat Trees is a DSA topic. In plain words you use it for a short Scapegoat Trees example in a short dry-run on paper. Don’t start with a slogan — start with that picture.

Smallest example: the smallest Scapegoat Trees example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Scapegoat Trees.

From the example next to this theory — Scapegoat Trees: dry-run [4, 1, 3].

Trap — only saying “Scapegoat Trees” with no example. Fix that before you talk about advanced DSA.

Viva — what is Scapegoat Trees? Then show the smallest Scapegoat Trees example you can type. Then name the trap.

Exam tip

What is Scapegoat Trees? Show this: the smallest Scapegoat Trees example you can type. Trap: only saying “Scapegoat Trees” with no example.

Example

# Scapegoat Trees
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Scapegoat Trees: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefScapegoat Trees — a short Scapegoat Trees example in a short dry-run on paper.
  • Rulethe smallest Scapegoat Trees example you can type
  • Traponly saying “Scapegoat Trees” with no example
  • Usea short dry-run on paper

Questions

1

What is Scapegoat Trees?

2

Give one small example of Scapegoat Trees.

3

What mistake do beginners make with Scapegoat Trees?

4

Where do you use Scapegoat Trees?

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